Impact-resistant sandwich structural element

Abstract

Impact-resistant sandwich structural elements containing at least one solid thermo-setting polyurethane layer and at least one polyurethane elastomer layer and a process for their preparation are disclosed. The elements are useful in preparing sanitary fittings, swimming pools, domestic refrigerators, wall panels, vehicles or furniture, in the construction industry, in waste-water technology or in coach-building.

What is claimed is:  
     
         1 . An article comprising a plurality of layers arranged in the sequence of components a) through f) wherein 
 a) is an optional decorative hard surface layer, and    b) is a solid thermosetting polyurethane layer, and    c) is a crosslinked polyurethane elastomer layer, and    d) is an optional polyurethane foam layer, and    e) is a solid thermosetting polyurethane layer, and    f) is an optional substrate,    each of said a) through f) being bonded to its neighboring components.    
     
     
         2 . An article comprising a plurality of layers arranged in the sequence of components a) through f) wherein 
 a) is an optional decorative hard surface layer, and    b) is a solid thermosetting polyurethane layer, and    c) is a crosslinked polyurethane elastomer layer, and    d) is an optional polyurethane foam layer, and    e) is a solid thermosetting polyurethane layer, and    f) is an optional decorative hard surface layer,    each of said a) through f) being bonded to its neighboring components.    
     
     
         3 . The article of  claim 1  wherein the polyurethanes (b) and (e) and the polyurethane of (c) are products of reactions having identical isocyanate reactants.  
     
     
         4 . A process for preparing the article of  claim 1  comprising applying said (b) to said (c) before said (b) has reached a non-tacky state and said layer combination of at least (b) and (c) to said (e) before said layer combination of at least (b) and (c) has reached a non-tacky state.  
     
     
         5 . The process of  claim 4  comprising applying each of said (b), said (c) and said (e) in the form of plurality of coats by spraying.  
     
     
         6 . The article of  claim 1  selected from the group consisting of sanitary fitting and body of a refrigerated vehicle.  
     
     
         7 . The article of  claim 2  selected from the group consisting of sanitary fitting and body of a refrigerated vehicle.